Count William of Sussex

William de Conteville (1084-) was a vassal of the Kingdom of England.

Biography
William de Conteville was born in 1084 to the House of Conteville, a dynasty of Catholic Normans. He was the son of Count Robert of Mortain, the half-brother of William the Conqueror, and he harbored a bitter dislike of his cousin Henry I of England. Incorrigibly turbulent, he had shameless arrogance and rejected the hand of Queen Matilda of Scotland's sister Mary Dunkeld. William joined Henry's enemy Robert of Normandy at the 1104 Battle of Tinchebray, where he was captured and stripped of the County of Mortain and his titles.